FINAL REPORT ON FREQUENCY-DOMAIN ANALYSIS OF INTERACTION EFFECTS BETWEEN TWO SHIPS IN WAVES USING THE 3-D PANEL METHOD

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Authors
  1. Hsiung, C.C.
  2. He, Y.J.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Technical Univ of Nova Scotia, Halifax NS (CAN) Centre for Marine Vessel Design and Research
Abstract
A new code structure has been established for solving the two-ship interaction problem in waves. The coupled motions are computed by the three-dimensional method with zero forward speed Green function and a simple forward speed correction is adopted. With this method the field points and source points are all distributed on the wetted surface of two ships (shipa and ship-b). The unsteady hydrodynamic forces, wave exciting forces and coupled motion amplitudes are computed based on the two ship interaction. Two ship double-body flow is used to determine steady flow disturbance potential and velocity distribution. In this computation, the m-term computation is performed by the integral equation method based on double body flow of two ship interaction. With the uniform flow assumption, the approximate m-terms can also be used in this study. Schmitke's method is applied to compute the viscous roll damping coefficient for ship-a and ship-b separately. The viscous interaction between two ships is neglected. Computations of spectral analysis for irregular waves are also carried out for ship-a and ship-b. Two cylinders floating in waves with zero forward speed are used as a numerical example to validate this method. The computed wave exciting force, interaction added mass and damping coefficients and coupled motion amplitudes are compared with the published results. Good agreement has been obtained. TRUNCATED
Keywords
Roll damping;Two ship interaction;Panel methods;Hull panelization;Frequency domain
Report Number
DREA-CR-96-446;CMVDR-96-3 — Contractor Report
Date of publication
01 Aug 1996
Number of Pages
103
DSTKIM No
97-00601
CANDIS No
500692
Format(s):
Hardcopy;Document Image stored on Optical Disk

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